Derek hadn't even gotten used to identifying herself as a female when she felt more changes begin. An intense itching sensation spread up her body. She shivered, too afraid to scratch, not even knowing where to start. She saw her clothes shifting and shrinking. Her hands came back into view as the sleeves shortened. Once her arm became visible, the source of her discomfort was obvious. Her skin was now covered in a coat of fine white hairs. She realized what the next stage in her transformation was.
"It's fur. I've got fur!" Derek squealed in amazement. She tried to guess what animal Sonya had chosen. White hair could mean a rabbit, or an albino squirrel.
As her clothes continued to retreat from her body, she could see several patches of fur darkening to black. She finally realized what she was becoming.
"A cow?!" she shouted. "My first transformation is into a COWGIRL?"
"You like cowgirls," Sonya insisted.
"I like LOOKING at cowgirls! I like WRITING about cowgirls! I never really wanted to BE one!"
"So?" Sonya flipped a stray red lock of hair over her shoulder. "If anything, this should make your writing about cowgirls more accurate."
Derek knew continuing the discussion was pointless. She was becoming a cowgirl, and there was nothing she could do about it. She wondered specifically what kind of cowgirl she was becoming. The kind with four breasts, the kind with two really huge breasts, or the kind with...
Yes, sure enough, a pressure below Derek's stomach clued her into the growth of an udder. By this point her clothes had completely vanished from her lower body, and her sweater had become a black shell top with thin shoulder straps and a hemline high enough to show her white fuzzy midriff. Beneath it, her undershirt had changed into a bra.
The area between Derek's legs was the only part of her not covered in fur, and it was growing outward like a balloon filling with water. It turned pinker, and grew four teats for milking. Derek had to widen her stance to allow the udder to hang between her legs without being squeezed.
Her feet hardened and morphed into cloven hooves. Her fingers merged from five down to three. In the mirror, she saw a black patch appear around her right eye. Her hair had begun to grow again, this time getting much longer. The bangs drooped over her eyes and she brushed them out of the way to continue watching her changes. Her hair was getting brighter, now a sandy brown instead of the darker shade she had before. Two triangular shapes emerged from her hair. They were her new cow ears, covered in white fur with black tips. They grew so long their own weight caused them to fold over and flop down the sides of her head. Her forehead pounded as two bumps appeared. From these bumps burst a pair of rock-solid cow horns that grew out several inches, thick and curvy.
A pulling sensation in the base of her spine signaled the beginning of her tail. This brought a surge of excitement. Derek had always dreamed of having a tail, and though she'd rather have a fox's tail or a cat's, she was still eager to feel what this new cow tail was like. Its ropey form grew down past her knees, with a thick white cuff at the end.
Her hair, meanwhile, grew past her shoulders and breasts. It had lightened to pure white by this point, except for two black streaks running down the middle. Suddenly, the hair snapped back, locks flying up into the air and twisting upon themselves. Derek watched intently as her hair gathered up in a thick braid. Its end was tied off with a black bow that appeared out of nowhere, and then it fell, slapping her back. The braid came all the way down to her waist, although it didn't include all of Derek's hair. There were still two locks of hair at her temples that were left to hang free down her chest.
There was a pinch in her nose, and Derek gasped at the arrival of a thick brass ring that now dangled there. It was so large, she could feel the cold metal against her upper lip.
She continued to examine her reflection, expecting more changes, but the strange feelings of transformation had subsided, leaving her a gorgeous cowgirl with an udder nearly the size of a volleyball.
Sonya tackled her from behind, giving the cowgirl a tight hug. "Oh, you're so soft!" she cooed into one of Derek's large floppy ears.
"Yeah, okay," Derek stammered. "So...can I change back now?"